Confirming structure of aspartic acid at PH 4

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SUMMARY

The discussion centers on confirming the structure of aspartic acid at pH 4. The participant calculated the isoelectric point (pI) and presented a structure, noting that at pH 4, approximately 62% of aspartic acid exists in the -1 charged form while 37% is neutral. The participant expressed doubt regarding the protonation state of the amine group in the drawn structure, indicating that the -1 form may not be accurately represented.

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Homework Statement


Draw the structure of aspartic acid at PH 4. I calculated the PI and based on that, drew the
charged structure. If anyone can confirm that this is the correct structure.

Homework Equations


The Attempt at a Solution


I attached the structure. Thanks for any assistance.
 

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At pH 4 solution contains about 62% of -1 form, and around 37% of neutral form. But I doubt -1 form is the one you have drawn, I don't think proton is on the amine group.
 

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